0.12.2dev: Fix calculation of priorities for Roadmap icalendar (ics) export.
0.12.2dev: Fix calculation of priorities for Roadmap icalendar (ics) export.

Thanks to Trevor MacPhail for original report + patch. Thanks Thijs Triemstra for updating and testing. Fixes #6289.

git-svn-id: 30ec3c1a2098df185a8733d0352d646269562639@10245 af82e41b-90c4-0310-8c96-b1721e28e2e2

exocad/exotrac,exocad/exotrac,moreati/trac-gitsvn,moreati/trac-gitsvn,moreati/trac-gitsvn,exocad/exotrac,moreati/trac-gitsvn,exocad/exotrac